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- tit ies smo JAMES'KIDDER, OFURBANA, OHIO, 'ASSIGNOR T0 HIMSE 3 sHUMArrn;

pound of sulphate of zi point one.

Letters Patent No. 104,741, dated June 28, 1870. v

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e W 'ihe Schedule referred to in, these tamer: Patent and making part Of the name.

I, Jsnrns KIDDER, of Urbana, Ghampaign county, Ohio, have invented a new and useful Tanning Process, of which the following is a specification.

TlwIngredientsu First. Japonica, gamt ir, cuteh, or bark.

""Second. A solution of potash, pearl-ash, or caustic soda.

Third. Sulphate of zinc.

Fourth. Sulphur.

Fifth. Sugar o'f lead. v

The .Eflects of the Different Ingredients on the Hides and the Purposcfor which h y are Used. First. Japonica, gambinrntch, 0r bark is the hnsis of our tanhing-composition.

Second. The solution ofpotash, pearl-ash,]or cnus-.

tic soda, neutralizes the acid in the first-named ingredients, that is destructive to the fiber of the leather. It hastens the tanning, and. gives greater strength to the fiber of the leather.

Third. Sulphate of zinc is an-ast-iingent. It contracts the fiber of the hide, and thereby gives the leather more body.

Fourth. Sulphur gives thc'leather softness and pliability."

Fifth. Sugar of lead is apowerful astringent. It

assists the third-named ingredient to fill up the leather.

It also hastens the process of tanning, and gives the leat herafair color. y

v Operation. 7

The aforenamed ingredientsare used as follows,lviz, (but we do not confine ourselves to the proportions or time specified, but give this as our mode of tanning To tan twelve hides of upper 16811116131186 :1. sufiieient quantity of water {recover the hides; then dissolve twenty-five pounds'pfjaponica or gambir; then add the solution to the water. Then compound three quarts of the solution of potash or pearl-ash, (the solution to equal the strength of strong lye,) and one Dissolve the zinc first in hot water; then add the compound to the tanningliquor'; then the liquor is ready for the hides. Place the hides into the tanning-liquor; handle them up 00- then take them out, and recasionally for two days; new the liquor by adding thirty-five pounds of japonice. or gamhir, dissolved as before, and poured into the liquor. Then'compound three quarts of the solution of potash or pearl-ash, two pounds of the sulphate of zinc, two poundsof sulphur. Dissolve the sulphate of zinc and sulphur in boiling water before compounding with the alkaline. When compounded, add to the tanning-liquor; then place .the hides in the liquor;

handle them up for four days; then take them out,

and renew the liquor by adding fortypounds of jaw ponica or gambir, dissolved as before, two quarts of the solution of pearl-ash or potash, two pounds of the s'ulphateof zinc, three pounds of sulphur, one and one-half pound of sugar of lead, to be dissolved and compounded as before, then added to the tanningliquor; then place the/hides into the liquor thus compounded, aud handle them up occasionally for five days; which completes the tanning operation of the twelve hides.

Calf-skins, harness, and all other kinds of leather, will be treated in quantities of ingredients and time proportionally.

To tan with hark, to each cord of harl: use two gab Ions of the solutions of potash or pearl-ash, five pounds of sulphate of zinc, five pounds of sulphur, and one i and one-half pound of sugar of lead.

Before adding the above-named ingredients to the bark-liquor, dissolve them in boiling water, then'c ru-- pound them, and add them to the bark-liquor.

For white-oak bark, double the quantities.

I Claim.

I claim as new andof my invention-'- The process for tanning leather, suhstant-iallyns herein described. p f h InI testimony of which invention, I hereunto set my ant. 1

JAMES KIDDER.

W itncsses:

G'Eo. H. KNIGHT, WM. M. Rnopns.

LF AND JAMES F. 

